Summary - Async basics

Combine async/await and create_task to write a parallel downloader.

Summary - Async basics

This group covered async basics. async def declares a coroutine; await marks waiting points; asyncio.run runs from the top; asyncio.sleep waits without blocking; create_task creates a background Task.

The final task combines async def, await and asyncio.run: you'll call one coroutine from another with await.

Exercise async def + await combined

Start with import asyncio. The function async def inner() returns 5. The function async def fetch() does return await inner() + 1. Add print(asyncio.run(fetch())).

Show example solution

import asyncio

async def inner():
    return 5

async def fetch():
    return await inner() + 1

print(asyncio.run(fetch()))

Test yourself

Which function runs a coroutine from the top?
- asyncio.run
- create_task
- asyncio.sleep
- time.sleep
Show answer

asyncio.run — asyncio.run runs a coroutine from the top.

Summary: async/await

async def fetch():
    ____ inner()

Show answer

async def fetch():
    await inner()

Match the group tools

async def

Declares a coroutine
await

Waiting point
asyncio.run

Runs from the top
create_task

Background Task

Next lesson: gather

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